The elements in group 3 of the periodic table are boron, aluminum, gallium, indium and thallium. Elements can be classified as metals or non-metals. Explain, using its position in the periodic table, weather indium is a metal or a non-metal.
The periodic table can be viewed in several chunks. The first two groups are your alkali and alkaline earth metals. Those are your basic metals. The middle chunk are the transition metals which most people are familiar with such as copper or gold. The right side of the periodic table is where things start to get indistinguishable.
There are a "stair" of elements known as metalloids. Boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), and tellurium (Te) are all metalloids. Anything to the left of those elements are considered metals and anything to the right are considered nonmetals.
Therefore, indium, which is to the left of the metalloids, is considered a metal.